It would be great if all the fast-food outlets, slaughterhouses, these laboratories and the banks who fund them exploded tomorrow.
The only thing permanent is change.
Rules for Happiness: something to do, someone to love, something to hope for.
If you punish a child for being naughty, and reward him for being good, he will do right merely for the sake of the reward; and when he goes out into the world and finds that goodness is not always rewarded, nor wickedness always punished, he will grow into a man who only thinks about how he may get on in the world, and does right or wrong according as he finds advantage to himself.
We are not rich by what we possess but by what we can do without.
Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above me and the moral law within me.
Enlightenment is man's leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! Have the courage to use your own intelligence! is therefore the motto of the enlightenment.
The real battlefield is the realm of ideas.
We cannot study everything at the same time.
Living to create an earthly legacy is a short-sighted goal.
In the spring mornings I would work early while my wife still slept. The windows were open wide and the cobbles of the street were drying after the rain.